# coding=utf-8
# Copyright 2024 The Google Research Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
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"""Constants for grammar.

Constants here are for grammar production rules and expressions generated by
context-free grammar.
"""

# expression string delimiter
EXPRESSION_DELIMITER = ' '

# Dummy production rule for padding.
DUMMY_PRODUCTION_RULE = 'Nothing -> None'
# Left hand side symbol for dummy production rule.
DUMMY_LHS_SYMBOL = 'Nothing'
# Right hand side symbol for dummy production rule.
DUMMY_RHS_SYMBOL = 'None'
